﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using TR1app;
using TR1app.Data;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Item Detail Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234232

namespace TR1app
{
    /// <summary>
    /// A page that displays details for a single item within a group while allowing gestures to
    /// flip through other items belonging to the same group.
    /// </summary>
    public sealed partial class ItemDetailPage : TR1app.Common.LayoutAwarePage
    {
        private static WebView ItemContentView = null;
        public ItemDetailPage()
        {
            this.InitializeComponent();
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            // Allow saved page state to override the initial item to display
            if (pageState != null && pageState.ContainsKey("SelectedItem"))
            {
                navigationParameter = pageState["SelectedItem"];
            }

            // TODO: Create an appropriate data model for your problem domain to replace the sample data
            var item = RSSDataSource.GetItem((String)navigationParameter);
            this.DefaultViewModel["Group"] = item.Group;
            this.DefaultViewModel["Items"] = item.Group.Items;
            this.flipView.SelectedItem = item;
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
            var selectedItem = (RSSDataItem)this.flipView.SelectedItem;
            pageState["SelectedItem"] = selectedItem.UniqueId;
        }

        private void flipView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            FlipView item = (FlipView)sender;
            RSSDataItem selectedItem = (RSSDataItem)item.SelectedItem;
            if (ItemContentView != null)
            {
                var flipViewItem  = this.flipView.ItemContainerGenerator.ContainerFromIndex(flipView.SelectedIndex);
                if (flipViewItem != null)
                {
                    var WV = FindFirstElementInVisualTree<WebView>(flipViewItem);
                    WV.NavigateToString(selectedItem.Content);
                }
            }           
        }

        private T FindFirstElementInVisualTree<T>(DependencyObject parentElement) where T : DependencyObject
        {
            var count = VisualTreeHelper.GetChildrenCount(parentElement);
            if (count == 0)
                return null;

            for (int i = 0; i < count; i++)
            {
                var child = VisualTreeHelper.GetChild(parentElement, i);

                if (child != null && child is T)
                {
                    return (T)child;
                }
                else
                {
                    var result = FindFirstElementInVisualTree<T>(child);
                    if (result != null)
                        return result;
                }
            }
            return null;
        }

        private void ItemContentViewer_Loaded(object sender, RoutedEventArgs e)
        {
            ItemContentView = (WebView)sender;
            RSSDataItem Item = flipView.SelectedItem as RSSDataItem;
            ItemContentView.NavigateToString(Item.Content);
        }


        private void TextBlock_Loaded_1(object sender, RoutedEventArgs e)
        {

        }

        private void ItemContentViewer_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
        {

        }

        private void AuthorContentViewer_Loaded(object sender, RoutedEventArgs e)
        {
            ItemContentView = (WebView)sender;
            RSSDataItem Item = flipView.SelectedItem as RSSDataItem;
            ItemContentView.NavigateToString(Item.AuthorInfo);
        }
    }
}